JEE Main · Chemistry · States of Matter
Ideal Gas Laws: JEE Main previous year questions
35 questions in the 108 JEE Main shifts Lumi analysed, in 6 of 8 years. Pattern: Asked most years. 5 came in 2024–26. Here is how it is asked and which ideas come back.
- Questions
- 35
- in 33 of 108 shifts
- Years asked
- 6/8
- last asked 2026
- Weighted estimate
- 0.0
- model; history: 0.2 a shift on average, typically 0.0–0.4
Key findings
- 01
Asked in 6 of 8 years with analysed shifts and in 33 of 108 shifts: 35 questions, #99 of 196 topics. The years that asked it were 1.2 apart on average.
- 02
43% of its questions since 2020 tested an idea no earlier year had asked; 16 repeated an idea from the year before.
- 03
The most repeated idea is Ideal Gas Equation, asked 10 times in 9 shifts (2021, 2022), most often as “mass of gas from pv=nrt”.
- 04
JEE Main has asked 11 of the 53 ideas in this topic; 40 have never been asked, directly or inside another question.
- 05
Mostly asked as numerical value (66%); 66% need a numerical answer, 40% are easy and 0% hard.
- 06
The skill tested most is calculation (74%), then multi-step (14%).
Questions a shift, year by year
Out of the 25 Chemistry questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.
Raw count: 2017: 0 in 1 shift · 2020: 2 in 12 shifts · 2021: 11 in 24 shifts · 2022: 14 in 24 shifts · 2023: 3 in 12 shifts · 2024: 0 in 18 shifts · 2025: 3 in 8 shifts · 2026: 2 in 9 shifts.
- Up to 2023
- 0.3
- a shift, of 25
- Since 2024
- 0.2
- 0.0
- Usual gap
- 1.2 yrs
- between years asking it
- Shifts with it
- 33/108
- 31% of analysed shifts
How it is asked
Difficulty, format and skill
Across all 35 questions on Ideal Gas Laws since 2017.
Difficulty
QUESTIONS- Easy14 · 40%
- Medium21 · 60%
- Hard0 · 0%
Format
SHARE- Numerical value · 23 Q66%
- Single correct · 9 Q26%
- Diagram based · 3 Q9%
Skill tested
SHARE- Calculation · 26 Q74%
- Multi-step · 5 Q14%
- Data or graph · 3 Q9%
- Application · 1 Q3%
Repeats
New idea, or one asked before?
Each column is a year. Blue questions tested an idea no earlier year had asked; navy ones went back to an idea from an earlier year. 2017 is the first year, so everything in it counts as new. Heights are question counts, and Lumi analysed 1 to 24 shifts a year, so compare the split inside a column rather than heights across years.
- Idea asked for the first time
- Idea asked in an earlier year
Coverage of the topic
JEE Main has asked 11 of the 53 ideas in this topic. 40 have never been asked yet.
- Asked directly11 · 21%
- Touched inside another question2 · 4%
- Never asked40 · 75%
Ideas come from Lumi’s JEE syllabus map. A never-asked idea is not a safe skip: across all of JEE Main, 22% of questions since 2024 tested an idea no earlier year had asked.
Drill down
Chapter, idea, question
Every idea JEE Main tested in this topic, with its eight years. Open one to read the questions.
10 ideas inside
Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.
Ideas
Every idea inside this topic
11 different ideas were tested; 6 came more than once.
mass of gas from pv=nrt
Numerical value · 9 shifts · 7 numericalpartial pressure ratios from mass percent
Numerical value · 7 shifts · 5 numericalfinal pressure in connected vessels
Numerical value · 4 shifts · 2 numericaltemperature from fractional pressure change
Numerical value · 3 shifts · 2 numericalpressure after volume decrease at constant temperature
Numerical value · 2 shifts · 3 numericalmolar mass from vapour density
Numerical value · 3 shifts · 2 numericaltemperature of mixture of two gas samples
Single correct · 1 shiftmolar mass from equal rms and most probable speed
Numerical value · 1 shift · 1 numericalgraph interpretation of ideal gas law
Diagram based · 1 shiftkinetic energy of ideal gas
Numerical value · 1 shift · 1 numericalgraph interpretation of ideal gas density
Diagram based · 1 shift
| Idea | Years asked | Times | Shifts | Format | Numerical |
|---|---|---|---|---|---|
| Ideal Gas Equationmass of gas from pv=nrt | 10 | 9 | Numerical valueCalculation | 7 | |
| Dalton's Lawpartial pressure ratios from mass percent | 7 | 7 | Numerical valueCalculation | 5 | |
| Connected Gas Bulbs Equilibriumfinal pressure in connected vessels | 4 | 4 | Numerical valueCalculation | 2 | |
| Gay-Lussac's Lawtemperature from fractional pressure change | 3 | 3 | Numerical valueCalculation | 2 | |
| Individual Gas Lawspressure after volume decrease at constant temperature | 3 | 2 | Numerical valueCalculation | 3 | |
| Gas Density and Molar Massmolar mass from vapour density | 3 | 3 | Numerical valueCalculation | 2 | |
| Mixing Gases from Different Vesselstemperature of mixture of two gas samples | 1 | 1 | Single correctApplication | – | |
| Gas Molecular Velocity Ratiosmolar mass from equal rms and most probable speed | 1 | 1 | Numerical valueCalculation | 1 | |
| Graphical Analysis of Boyle's Lawgraph interpretation of ideal gas law | 1 | 1 | Diagram basedData or graph | – | |
| Translational Kinetic Energykinetic energy of ideal gas | 1 | 1 | Numerical valueCalculation | 1 | |
| Graphical Analysis of Gas Lawsgraph interpretation of ideal gas density | 1 | 1 | Diagram basedData or graph | – |
Times and shifts count every analysed shift. Across JEE Main, 78% of questions since 2024 went back to an idea an earlier year had asked; the rest were new. All repeated ideas
Every question
Ideal Gas Laws questions, year by year
The opening words of each question as it appeared in the official paper, with the idea it tested. Open one for its options and the official answer.
JEE Main 20262 questions in 2 shifts
- 4 Apr, Shift 1Q35One gas of mole of molecules at temperature , volume , and pressure , and another gas of mole of molecules at…
Idea: Mixing Gases from Different Vessels
New ideaMediumSingle correct - 6 Apr, Shift 1Q35Two closed vessels of same volume are joined through a narrow tube and both vessels are filled with air of pressure 90 kPa and temperature…
Idea: Connected Gas Bulbs Equilibrium
Asked the year beforeMediumSingle correct
JEE Main 20253 questions in 3 shifts
- 3 Apr, Shift 2Q34Pressure of an ideal gas, contained in a closed vessel, is increased by 0.4% when heated by C. Its initial temperature must be:
Idea: Gay-Lussac's Law
MediumSingle correct - 4 Apr, Shift 2Q45There are two vessels filled with an ideal gas where volume of one is double the volume of other. The large vessel contains the gas at 8…
Idea: Connected Gas Bulbs Equilibrium
MediumSingle correct - 7 Apr, Shift 1Q51At the sea level, the dry air mass percentage composition is given as nitrogen gas: 70.0, oxygen gas: 27.0 and argon gas: 3.0. If total…
Idea: Dalton's Law
MediumSingle correct
JEE Main 20233 questions in 3 shifts
- 8 Apr, Shift 1Q81[figure: three bulbs joined by pipes with stopcocks] Three bulbs are filled with , and Ne as shown in the…
Idea: Connected Gas Bulbs Equilibrium
MediumNumerical value · figure - 10 Apr, Shift 1Q81At constant temperature, a gas is at a pressure of 940.3 mm Hg. The pressure at which its volume decreases by 40% is __________ mm Hg.…
Idea: Individual Gas Laws
Asked the year beforeEasyNumerical value - 12 Apr, Shift 1Q81At 600K, the root mean square (rms) speed of gas X (molar mass = 40) is equal to the most probable speed of gas Y at 90K. The molar mass…
Idea: Gas Molecular Velocity Ratios
New ideaEasyNumerical value
JEE Main 202214 questions in 12 shifts
- 25 Jul, Shift 1Q83The pressure of a moist gas at C is atm. The volume of the container is doubled at the same temperature. The new pressure of…
Idea: Dalton's Law
Asked the year beforeMediumNumerical value - 25 Jul, Shift 2Q82A sealed flask with a capacity of 2 dm contains 11 g of propane gas. The flask is so weak that it will burst if the pressure becomes 2…
Idea: Ideal Gas Equation
Asked the year beforeMediumNumerical value - 26 Jul, Shift 1Q82A mixture of hydrogen and oxygen contains 40% hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is…
Idea: Dalton's Law
Asked the year beforeMediumNumerical value - 26 Jul, Shift 2Q81A 10 g mixture of hydrogen and helium is contained in a vessel of capacity 0.0125 at 6 bar and 27°C. The mass of helium in…
Idea: Ideal Gas Equation
Asked the year beforeMediumNumerical value - 29 Jul, Shift 2Q81‘x’ g of molecular oxygen () is mixed with 200 g of neon (Ne). The total pressure of the non-reactive mixture of…
Idea: Dalton's Law
Asked the year beforeEasyNumerical value - 24 Jun, Shift 2Q81At 300 K, a sample of 3.0 g of gas A occupies the same volume as 0.2 g of hydrogen at 200 K at the same pressure. The molar mass of gas A…
Idea: Ideal Gas Equation
Asked the year beforeMediumNumerical value - 25 Jun, Shift 2Q56When a gas filled in a closed vessel is heated by raising the temperature by , its pressure increases by 0.4%. The…
Idea: Individual Gas Laws
New ideaMediumNumerical value - 25 Jun, Shift 2Q82A rigid nitrogen tank stored inside a laboratory has a pressure of 30 atm at 06:00 am when the temperature is 27 °C. At 03:00 pm, when the…
Idea: Individual Gas Laws
New ideaEasyNumerical value - 26 Jun, Shift 1Q62An evacuated glass vessel weighs 40.0 g when empty, 135.0 g when filled with a liquid of density 0.95 g mL and 40.5 g when filled…
Idea: Ideal Gas Equation
Asked the year beforeMediumSingle correct - 26 Jun, Shift 1Q852.0 g of gas is adsorbed on 2.5 g of platinum powder at 300 K and 1 bar pressure. The volume of the gas adsorbed per gram…
Idea: Ideal Gas Equation
Asked the year beforeMediumNumerical value - 27 Jun, Shift 1Q50A mixture of hydrogen and oxygen has volume , temperature 300 K, pressure 100 kPa and mass 0.76 g. The ratio of…
Idea: Ideal Gas Equation
Asked the year beforeMediumSingle correct - 27 Jun, Shift 2Q61Which amongst the given plots is the correct plot for pressure (p) vs density (d) for an ideal gas?
Idea: Gas Density and Molar Mass
Asked the year beforeEasyDiagram based · figure - 29 Jun, Shift 1Q81Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is at…
Idea: Gas Density and Molar Mass
Asked the year beforeMediumNumerical value - 29 Jun, Shift 2Q81A box contains 0.90 g of liquid water in equilibrium with water vapour at 27°C. The equilibrium vapour pressure of water at 27°C is 32.0…
Idea: Ideal Gas Equation
Asked the year beforeMediumNumerical value
JEE Main 202111 questions in 11 shifts
- 3 Aug, Shift 1Q51Assuming is an ideal gas, consider the quantity “P.”, where ‘P’ is the pressure in atm and ‘’ is the density in g…
Idea: Gas Density and Molar Mass
New ideaMediumNumerical value - 3 Aug, Shift 2Q52The total kinetic energy of 10 moles of a monoatomic ideal gas at 25°C in kJ is . (Nearest integer) [R = 8.314 J…
Idea: Translational Kinetic Energy
New ideaEasyNumerical value - 4 Aug, Shift 2Q52A gaseous mixture of helium and oxygen contains 20% helium by weight. If the partial pressure of oxygen in the mixture is 5 atm, the…
Idea: Dalton's Law
Asked the year beforeEasyNumerical value - 27 Aug, Shift 2Q52Two flasks I and II shown below are connected by a valve of negligible volume. [figure: two circular flasks joined through a valve; flask…
Idea: Connected Gas Bulbs Equilibrium
New ideaMediumNumerical value · figure - 31 Aug, Shift 1Q31Which one of the following is the correct PV vs P plot at constant temperature for an ideal gas ? (P and V stand for pressure and volume…
Idea: Graphical Analysis of Boyle's Law
New ideaEasyDiagram based · figure - 31 Aug, Shift 2Q7A mixture of hydrogen and oxygen has volume cm, temperature K, pressure kPa and mass g. The ratio of masses…
Idea: Ideal Gas Equation
New ideaMediumSingle correct - 24 Feb, Shift 2Q52The volume occupied by 4.75 g of acetylene gas at C and 740 mmHg pressure is __________ L. (Rounded off to the nearest integer)…
Idea: Ideal Gas Equation
New ideaEasyNumerical value - 25 Feb, Shift 1Q52A car tyre is filled with nitrogen gas at 35 psi at C. It will burst if pressure exceeds 40 psi. The temperature in C at…
Idea: Gay-Lussac's Law
New ideaEasyNumerical value - 25 Jul, Shift 1Q52A home owner uses of methane () gas, (assume is an ideal gas) in a year to…
Idea: Ideal Gas Equation
New ideaEasyNumerical value - 25 Jul, Shift 2Q52An LPG cylinder contains gas at a pressure of 300 kPa at 27°C. The cylinder can withstand the pressure of Pa. The room…
Idea: Gay-Lussac's Law
New ideaEasyNumerical value - 17 Mar, Shift 1Q52The pressure exerted by a non-reactive gaseous mixture of 6.4 g of methane and 8.8 g of carbon dioxide in a 10 L vessel at C is…
Idea: Dalton's Law
Asked the year beforeEasyNumerical value
JEE Main 20202 questions in 2 shifts
- 2 Sep, Shift 1Q31Which one of the following graphs is not correct for ideal gas ? = Density, = Pressure, = Temperature
Idea: Graphical Analysis of Gas Laws
New ideaMediumDiagram based · figure - 3 Sep, Shift 2Q31A mixture of one mole each of , He and each are enclosed in a cylinder of volume V at temperature T. If the…
Idea: Dalton's Law
New ideaEasySingle correct
Questions from the official JEE Main Paper 1 shifts published by NTA (CBSE for 2017). Questions NTA dropped are left out. Topic and idea tags, counts and notes are Lumi’s.